GetDBShardIDFromDomainID maps domainID to a DBShardID.

GetDBShardIDFromDomainIDAndTasklist maps <domainID, tasklistName> to a DBShardID.

GetDBShardIDFromHistoryShardID maps historyShardID to a DBShardID.

GetDBShardIDFromTreeID maps treeID to a DBShardID.

this means the query needs to execute in all dbShards in sharded SQL driver (currently not supported).

this means the query need to execute in one shard but the shard should be fixed/static, e.g.

this is should never being used in sharded SQL driver.

ErrTTLNotSupported indicates the sql plugin does not support ttl.